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The shock is one thing, for sure but if you have a high spring rate, it will reduce the travel for the same amount of force compared to a lower spring, so with high spring rates the shock plays less of a role in comfort.

With 500# springs, the car would 'bang' over a bump with no shock at all; then keep bouncing lol.

Do you find the GCs noisy? Mine clunk like a mofo from the front and I've never been able to figure out why.

If you've ever heard a blown rear shock mount, that's the sound I have, even over small bumps. I believe its the sound of all the pieces in the strut assembly gently coming apart and going back together again over a bump.. The tiny amount of 'play' in all the components, since they're not under load like a traditional strut, causes everything to clunk.

At least, that's my best guess. I have no bad components or anything, and I've been in another (non-E30) coilover car which did the same thing. Its irritating though.

edit: with 40 or 45 series tires, pavement ridges from road construction or giant pot holes don't "bang", they "SLAM". It sounds like the whole strut tower is going to break. Of course, I have poly everything which doesn't help. :/

That's sort of what I was picturing in my head happening. The ride height that my car is set at is very lightly preloading the spring so that helps keep everything in the assembly together when the strut is unloaded. If I were to go lower, I'd probably experience what you're describing

Yeah, I'm glad I have the 55 aspect ratio tires to offer a bit of cushion.

I've been thinking of trying a tender spring to see if it helps, which is a light (10#) spring that is long, that compresses fully under load but keeps everything "together" when you go over a bump. They're required by law in Germany actually.